Stop-check valve.



PATENTED OUT. 16, 1906.

v L. SGHUTTE. STOP CHECK VALVE.

APPLIOATION FILED FEB.14. 1906.

2 SHEETS-SHEET l.

INV EN TOR No. 833,420. PATENTED OCT. 16, 1906. L. SGHUTTE.

STOP CHECK VALVE.

APPLIOATION FILED FEBJA. 1906.

2 SHEETS-SHEET 2.

WlTfiJ-ESSES INVENTOR UNITED STATES PATENT OFFICE.

LOUIS 'SOHUTTE, OFPHILADELPHIA, PENNSYLVANIA, ASSIGNORITO SUHUTTE ANDKOERTING COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OFPENNSYLVANIA.

i STOP-CHECK IALVE.

Patented Oct. 16, 1906.

Application filed February 14,1906. Serial No. 300,955.

To a whom it may concern:

Be it known that I, LOUIS SoHUTTE, a citizen of the United States ofAmerica, residing in the city and county of Philadelphia, in the Stateof Pennsylvania, have invented a certain new and useful Improvement inStop- Oheck Valves, of which the following is a true and exactdescription, reference being had to the accompanying drawings, whichform a part thereof.

My invention relates to valves such as are placed in steam-pipes leadingfrom a boiler to an engine, said valves opening freely under a normalflow of steam and closing under a reverse flow.

The object of my invention is to providemeans for promptly andpowerfully closing such valves against the boiler-pressure and also forpreventing chatter and to attain these results by improved andconvenient mechanism and constructive details.

The nature of my improvements will be best understood as described inconnection with the drawings, in which they are illustrated, and inwhich Figure 1 is a central vertical section through a valve embodyingthe broader features of my invention; Fig. 2, a similar section througha modified form of valve, also embodying leading features of myinvention; Fig. ,3, a similar section through my preferred valveconstruction embodying all features of my invention; Fig. 4, across-section on the line 4 4 of Fig. 3 and Fig. 5, a similar sectionthrough a portion of a valve, illustrating a practicable modificationof, my invention.

Referring first to the construction of Fig. 1, A is the valve-casing,having an inletchamber B and outlet-chamber B and a valve-seated openingB intervening between these chambers. The upper or outlet chamber B hasan opening at its top which is closed by the head B an open-endedcylinder C being secured in place by this head immediately above thevalve-seat. D is the valve, which is formed with an upwardly-extendingstem D and a downwardly-extending stem D the stem D having secured to itthe piston E, working in the cylinder O, the fit between the cylinderand piston being such as to permit a restricted flow of steam past thepiston into the upper end of the cylinder. The downwardly-extending stemD F in the cylinder or by a small orifice, such as.

0, formed in the piston.

L is a valve-closing stem actuated 1n any convenient manner from abovethe valve-casing and normally retracted, but capable of being forceddownward, as shown in Fig. 1, to keep the valve' closed, the head Lresting on the bottom of the piston E or the end of the valve-stem D, asshown. In normal operation the cock I is closed and the cylinder H belowthe piston filled with steam at the same pressure as that in the chamberB. Under these circumstances the valve D will be opened, leaving anunobstructed passage through the casing for steam from the boiler. Therestricted orifice into the cylinder O permits this cylinder also to befilled with steam at the same pressure as that in the, chamber B; but byopposing any rapid fluctuation in the pressure the piston E acts toprevent any chattering of the valve on its seat, and also in case of anyfall in pressure infthe boiler to assist in the prompt seating of thevalve. When it is desired to close the valve against normalboiler-pressure, it is only necessary to open the cock I permitting thesteam in the cylinder H to exhaust, whereupon the pressure on the top ofthe pistonFwill at once cause the valve D to seat itself, closing offfurther flow ofsteam.

In the modification shown in Fig. 2 the valve-casing, here indicated atA, is formed with an inlet-chamber B and outlet-chamber B connectingthrough a valve-seated port, as before, the casing being formed withanopening above the valve-seat closed by a head B which secures in placea cylinder O, as in the before-described construction. In thisconstruction the piston E, moving in cylinder C, is connected with avalve D through an extension D which is virtually a continuation of thepiston, leaving a similar amount of the upper face of the valve exandthe chambers B and K.

D to the bottom of the cylinder H,

The downwardly-extendposed to pressure.

connects, as before, with a ing valve-stem D istonF, which moves in acylinder (indicated I In both modifications heretofore described itisnecessary to provide means for securing the cylinders H valve, and thepiston working in it to be inserted from below. It is obviouslyadvantageous, however, that the whole structure should be insertible andwithdrawable through the usual top opening in the casing, and this Ihave provided for in the construction shown in Fig. 3, in which thevalve and the ports above the valve are secured in a casing (indicatedat A) and having inlet and outlet-chambers B and B in the same manner asalready described in theearlier modifications. The casing in the portforming the chamber B is, however, formed with a'cylinder-seat K ofgenerally cylindrical form and provided, as shown, with vertical portsK, communicating with lateral ports K. The lower chamber of this casing(indicated at K) connects through a port K and outlet-pipe K theexhaust-pipe K being provided with a cock I, as already described. Inthis cylindrical casing K is inserted a double cylinder H H, the twoparts being separated by a partition H below which a series of ports Hconnect-the lower cylinder H with the ports K and K, a series ofconically-ended bolts N serving both to lock the cylinder in posi tionand to regulate the amount of flow through the ports K to the ports K.The downwardly-extending valve-stem has secured to it a piston F,working in the upper cylinder H and a downwardly-extending hollowportion D of the piston-rod has secured to it the piston F working inthe lower cylinder-chamber H. The cylinder H below the valve F, is infree communication with the chamber K, forming the end of the cylinderII. In this construction it will be seen that the steam in theinlet-chamber B will have restricted access to the cylinder I-I past theloose-fitting piston F and free access from said cylinder through thehollow stem also that the lower part of the cylinder H is in restrictedcommunication with the ports K Obviously when the outlet-cock I isopened the steam escapes freely from the bottom of both cylinders, andthe pressure on the tops of both pistons will at once press the pistonsdown and carry the valve D to its seat. The advantage of thisconstruction is that it en- H in position beneath thewhich will permitboth the cylinder ables me to obtain an effective piston area greaterthan that of the valve D, while at the same time the two tandem-setpistons and the cylinder-casing in which they work can be withdrawn andinserted through the valve ort.

p In the construction shown in Fig. 5 I have indicated a construction inwhich the cylinder C is dispensed with, a cylinder D being formed in anupwardly-extending valve-stem D through a packing M, at the end of whichextends a plunger-like extension L of the usual valve-stem used forlocking the valve D closed. Obviously this construction embodies some ofthe merits and advantages of the cylinder 0, as described in the othermodifications, and I insert it in this figure of the drawings simply toindicate that I do not wish to be confined strictly to the specialconstruction involving the use of the cylinder D and piston E.

Having now described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. A valve-casing having in combination a stop-check valve set to openin the direction of the normal flow of fluid, one or more cylinders ofgreater aggregate area set in the admission side of the casing, a pistonattached to the valve and fitting in the cylinder, a restrictedconstantly-open passa e whereby the fluid in the casing will gradua lyenter the cylinder below the piston, a port leading from the cylinder toexhaust and a valve for opening and closing said port.

2. Avalve-casing having in combination a stop-check valve set to open inthe direction of the normal flow of fluid, one or more cylinders ofgreater aggregate area set in the admission side of the casing, a pistonattached to the valve and fitting in the cylinder, a restrictedconstantly-open passage whereby the fluid in the casing will graduallyenter the cylinder below the piston, a port leading from the cylinder toexhaust, a valve for opening and closing said port, a second cylinderset in the receiving side of the casing and a second piston alsoattached to the valve and fitting in said cylinder, and means wherebythe fluid in the casing can gradually pass to or from the cylinder abovethe piston.

3. A valve-casing having in combination a stop-check valve set to openin the direction of the normal flow of fluid, two 0 linders, each ofsmaller sectional area than the valve and together of greater areaarranged in tandem in the admission side of the casing the upper endsbeing open thereto, two tandem pistons fitting in said cylinders andboth secured to the valve, means whereby a restricted flow of fluid ispermitted from the casing to the under sides of the istons, portsconnecting the tandem cylin ers toexhaust and a valve for opening andclosing the exhaust.

4. A vaive-caslng having in combination a stop-check valve set to openin the direction of the normal flow of fluid, a cylinder-casing of lessexternal diameter than the opening in the valve-seat having formed in ittwo tandem cylinders, means for securing said casing in the admissionside of the valve-casing, two tandem pistons fitting in said cylindersand both secured to the valve, means whereby the fluid in thevalve-casing is gradually admitted to the cylinders, ports connectingthe cylinders to exhaust and a valve for opening and closing theexhaust.

5. A valve-casing having in combination a stop-check valve set to openin the direction of thenormal flow offiuid, a cylinder-casing of lessexternal diameter than the opening in the valve-seat having formed in ittwo tandem cylinders, a fixed cylinder-receiving chamber in theadmission side of the casing and having a chamber K adapted to form thebottom of the lower tandem cylinder, a port leading from said chamber toexhaust, a valve for opening and closing the exhaust, a connected to themain valve working through both cylinders and opening at its end intothe lower cylinder and through its side into the upper cylinder, twopistons secured to said rod and working in the tandem cylinders, andmeans whereby the fluid in the valve-casing has gradual admission to thetwo cylinders.

LoiiIs SOHUTTE.

Witnesses: D. W. HILDRETH,

T. H. KOEHLER.

